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authorOri Bernstein <ori@eigenstate.org>2014-09-15 02:28:27 -0400
committerOri Bernstein <ori@eigenstate.org>2014-09-15 02:28:27 -0400
commitb24267e29842d9f8fd513af63176fd099d1ef204 (patch)
tree5b3f5f51c1a12c93363f3c358a1e55a34314e22d /rt
parentcec4decf37b8eab103846cc90cdb3dddd45c71ca (diff)
downloadmc-b24267e29842d9f8fd513af63176fd099d1ef204.tar.gz
Add missing file abort.s
This contains the code for dying out of memory. W00t string formatting in assembly!
Diffstat (limited to 'rt')
-rw-r--r--rt/abort.s41
1 files changed, 41 insertions, 0 deletions
diff --git a/rt/abort.s b/rt/abort.s
new file mode 100644
index 0000000..8ac1c02
--- /dev/null
+++ b/rt/abort.s
@@ -0,0 +1,41 @@
+.text
+
+.globl _rt$abort_oob
+.globl __rt$abort_oob
+_rt$abort_oob:
+__rt$abort_oob:
+ /* format pc */
+ movq (%rsp),%rax
+ movq $15,%rdx
+.loop:
+ movq %rax, %rcx
+ andq $0xf, %rcx
+ movb .digitchars(%rcx),%r8b
+ movb %r8b,.pcstr(%rdx)
+ subq $1, %rdx
+ shrq $4, %rax
+ jnz .loop
+ /* write abort message */
+ movq $1, %rax /* write(fd=%rdi, msg=%rsi, len=%rdx) */
+ movq $2, %rdi /* fd */
+ movq $.msg, %rsi /* msg */
+ movq $(.msgend-.msg), %rdx /* length */
+ syscall
+ /* kill self */
+ movq $39,%rax /* getpid */
+ syscall
+ movq %rax, %rdi /* save pid */
+ movq $62, %rax /* kill(pid=%rdi, sig=%rsi) */
+ movq $6, %rsi /* kill(pid=%rdi, sig=%rsi) */
+ syscall
+.data
+.msg: /* pc name: */
+ .byte '0','x'
+.pcstr:
+ .byte '0','0','0','0','0','0','0','0'
+ .byte '0','0','0','0','0','0','0','0'
+ .ascii ": out of bounds access\n"
+.msgend:
+
+.digitchars:
+ .ascii "0123456789abcdef"